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G. W. KORN.

POCKET KNIFE. No. 306,839. Y PatentedyOot. 21. 1884.

MG/JM W ATENT F F ICE.

GEORGE \V. KORN, OF NEIV YORK, N. Y.

POCKET-KN! FE.

SPECIFICATIQN forming part of Letters Patent No. 306,839, dated October 21, 1884.

Application filed October 25, 1883. (No model.)

To all whom it may concern.-

Be it known that I, GEORGE W. KORN, a citizen of the United States, residing at the city of New York, in the State of New York,

have invented a new and useful Improvement inFly-Open Knives, of which the followingis the specification.

Figure 1 is a longitudinal section. Fig. 2 is'a longitudinal section through line 2 2, of Fig. 1, looking in the direction indicated by the arrows. Fig. 3 is a detail at the end of handle, showingjoint where blade is united to handle and spring used, the bolster being removed. Fig. at is aback view of same end shown in Fig. 3, showing locking device for holding the bladein position and its way ofworking. Fig. 5 is a detail of the bolster, it being removed, and looking from the'under side. Fig. 6 is a cross-section of Fig.5 through line b b.

The-nature and object of'this invention is to provide a simple and efficient means of constructing a fiy-open knife.

Similar letters of reference refer to similar parts'in the different drawings.

A is the handle.

B is the blade.

O is the back and spring for throwing open the blade, it being constructed for discharging this double duty.

E is abolster at end of handle. F is the other bolster at same end of knife.

H is a spring fixedly fastened at one end to the lining I.

J isapin passing through front end of bolster F, through lining I, and into hole K in blade 13.

L is a hole in end of blade 13. a

O is the pivot which holds the handle and blade together.

It will be observed that the holes L and K and pivot O are in the same line, and the holes L and K an equal distance, respectively, from pivot O. The lining I is cut away to form the shoulders N N.

P P are guards on the handle. The bolster F is cut away between the edges, leaving the edges extending below the surface of the space between them, as shown in Figs. 5 and 6. WVhen the bolster is in position, these projecting edges rest upon the shoulders N N of lining I. (See Fig. 8.) The pin J is formed with a screw-thread a part of itslength and smooth the remainder of its length. The spring H at its front end is made thicker than the rest of its distance, and through this thick end the pin J passes. This pin J passes through the bolster F, the spring H, and into the hole K in the blade. The hole in thick end of spring H is formed with a screw-thread, and into which the screw-threaded part of pin J fits.

This pin J is countersunk in the bolster By depressing the rear end of bolster F over the shoulders N N, which act as fulcrum, the front end of spring H is raised, the pin Jlifted out of the hole K in the blade, when the blade can be closed, and the bolster and spring will return to their position. The pin J enters the hole L on the opposite side of pivot O.

When the blade is closed, the spring 0 is depressed, and by depressing the rear end of bolster F, as before described, the pin J is lilted out of hole L, and the spring 0, throws the blade open, when it is held in position by pin J.

S, Figs. 1 and 3, isarestin the blade. which prevents it from flying back too far. In this construction the bolster F discharges the double duty of an ordinary bolster and that of a lever to actuate the spring H.

I am aware that fly-open knives have been made worked by means ofa lever and a spring. A knife of this character is shown in Patent N 0. 273,858, dated March 13, 1882, granted to the undersigned, upon which this is anim provement.

I claim In combination with a fly-open knife, the bolster F, made to discharge the double duty ofa lever to actuate the spring H and of an ordinary bolster, as and for the purpose shown.

' GEORGE W. KORN. Witnesses:

J. I. McELRoY, F. J. GRIFFEN. 

